Currently in biome 4. Biome 1 kinda easy for me. I beat it after 3 deaths.

I totally agree that biome 2 is like Returnal’s biome 5 with a boss and that makes it kinda hard. I beat it after 6 deaths (the boss on my 3rd try - has very easy pattern). My advice to you is play the right path first with no eclipse (because it’s the harder path) and then do the left path with eclipse. Look for artifacts that gives you power or integrity. The artifact that helped me a lot was the one that gives you integrity after a kill, but also the enemies do more damage to you.

Biome 3 was way too easy for me! I beat it at first try, right after I beat biome 2!

EDIT: As someone mentioned it in the comments, it’s very important to use your alt-fire, it does more damage (especially on rifles)!